Brother DP-525CJ - 8. Keyboard System

THEORY
Electrical
SERVICE MANUAL
2-16
8. Keyboard System
8.1. FPC Operation
The keyboard is a flexible printed circuit (FPC) board on which the circuit pattern and
electrodes are printed. When a key is pressed, the key stem is forced down until the
carbon-type conductive silicone rubber makes a contact with the FPC electrode and
electricity is conducted. See Fig. 2.16.
Key Actuator
Contact Rubber
Carbon Silicon Conductive Rubber
FPC Board
Base Plate
Carbon Electrodes
Fig. 2.16 Key/FPC Operation